I don't get your thought process here. Are you saying that spending 3 hours practicing track/field or swimming is somehow better or more productive than 3 hours of baseball? If so what's the difference.
I would think that "high achievers", as you call them, can be as readily found on the baseball field as in the pool or running around the track. If a kid enjoys playing a sport what difference does it make what sport it is.
I think you premise is kind of strange. If you want your kid around only "high achievers" try the debate team or ask this same question on the high achiever website.